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Zinc Finger 280B regulates sGCα1 and p53 in prostate cancer cells

Shuai Gao1, Chen-Lin Hsieh, Jun Zhou

  • 1Department of Biological Sciences, University of Toledo, Toledo, Ohio, United States of America.

Plos One
|November 16, 2013
PubMed

Insights

Zinc Finger 280B (ZNF280B) promotes prostate cancer growth by down-regulating p53. ZNF280B increases Mdm2 expression, leading to p53 degradation and supporting cancer cell survival.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Soluble guanylate cyclase alpha 1 (sGCα1) is implicated in prostate cancer.
  • Zinc Finger (ZNF) 280B is an uncharacterized protein with potential roles in cancer.

Purpose of the Study:

  • To investigate the function of ZNF280B in prostate cancer.
  • To elucidate the molecular mechanisms by which ZNF280B affects cancer progression.

Main Methods:

  • Knock-down and over-expression experiments were used to assess ZNF280B function.
  • Western blotting and quantitative PCR were employed to analyze protein and gene expression.
  • Immunofluorescence was utilized to track p53 localization.
  • Luciferase reporter assays were performed to study Mdm2 promoter activity.

Main Results:

  • ZNF280B promotes prostate cancer cell growth and survival.
  • ZNF280B up-regulates sGCα1 expression but does not mediate its own pro-cancer effects.
  • ZNF280B down-regulates p53 by inducing its nuclear export and proteasomal degradation.
  • ZNF280B up-regulates Mdm2 expression via the Mdm2 promoter.
  • ZNF280B levels are elevated in prostate cancer correlating with reduced p53 levels.

Conclusions:

  • ZNF280B exerts pro-growth and pro-survival functions in prostate cancer.
  • ZNF280B suppresses p53 by increasing Mdm2 expression, representing a novel mechanism of p53 inactivation in prostate cancer.

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